Im gonna go against the grain here, so hold your pitchforks please, but I think its better than if it were consistent. Let me explain:

The author notices that adding a toolbar changes the radius, and to me it makes sense. If theres a toolbar, I know how much I can cut the corners, because the icons in the toolbar are not gonna be in far corner. At the same time, when I am unsure about what type of content might get cut by the corner, I will reduce the cut slightly to give that content more space.

I couldnt care less that one radius is not the same as another, I guess my OCD levels are not that high (yet?).

And I say all of this as someone who dislikes the glass design, and especially hates the small, slowly fading in volume/brightness indicators in the corner replacing the mid screen beautiful instant indicator.